上海交通大学学报

上海交通大学学报 >

2017 , Vol. 51 >Issue 11: 1348 - 1354

DOI: https://doi.org/10.16183/j.cnki.jsjtu.2017.11.010

兵器工业

16Mn钢摩擦螺柱焊接头的微观组织与局部腐蚀

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  • 1. 北京石油化工学院 能源工程先进连接技术研究中心， 北京 102617； 2. 北京化工大学 机电工程学院， 北京 100029

网络出版日期: 2017-11-30

基金资助

北京市自然科学基金项目（3152011），国家自然科学基金项目（51305036）

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Microstructure and Local Corrosion Behavior of Friction Stud Welding of 16Mn Steel

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  • 1. Research Center of Energy Engineering Advanced Joining Technology, Beijing Institute of Petrochemical Technology, Beijing 102617； 2. School of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029

Online published: 2017-11-30

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摘要

为了研究16Mn钢水下摩擦螺柱焊接头的微观组织及微区电化学腐蚀行为，采用扫描振动参比电极技术(SVET)和局部电化学阻抗谱(LEIS)对摩擦螺柱焊接头处不同区域的腐蚀电流密度及电化学阻抗进行了测试分析；采用金相显微镜和扫描电子显微镜观察了焊接接头腐蚀前后的金相组织和微观形貌；采用X射线应力测定仪测定了焊件不同区域的残余应力.结果表明：16Mn钢摩擦螺柱焊接件在焊缝区晶粒最为细小，组织最为致密；另外，焊件上的残余应力均呈现为压应力，且在焊缝处的压应力最小(-96MPa)；SVET和LEIS试验结果表明，焊缝处的腐蚀电流密度最小，约为0.3霢/cm2，局部阻抗值最大，约为169k?.这说明在焊件接头各区域中，焊缝处的耐腐蚀性最好，原因可能是焊缝区的微观组织比较致密，并且残余应力较小.

关键词： 摩擦螺柱焊; 微观组织; 残余应力; 扫描振动参比技术; 局部电化学阻抗谱

本文引用格式

顾艳红1，马慧娟1，高辉1，车俊铁1，焦向东1，田路1,2 . 16Mn钢摩擦螺柱焊接头的微观组织与局部腐蚀[J]. 上海交通大学学报, 2017 , 51(11) : 1348 -1354 . DOI: 10.16183/j.cnki.jsjtu.2017.11.010

Abstract

In order to have a good understanding of the local corrosion behavior of 16Mn steel welded joint by friction stud welding technology, scanning vibrating electrode technique (SVET) and local electrochemical impedance spectroscopy (LEIS) were performed to investigate the corrosion current density and the impedance distribution of the welded 16Mn steel joint along stud, heat affected zone (HAZ), welded zone (WZ), another HAZ and base metal (BM). Metallographic microscope and scanning electron microscope (SEM) were used to observe the microstructure of welded joints. Residual stress in the different zones of the welded sample was measured by an X-ray stress tester. The results show that the weld zone has finer crystalline grains and denser microstructure than other zones. The residual stresses of the welded sample are shown as compressive stress, and the compressive stress in the weld zone is the smallest (-96MPa).The SVET and LEIS data indicate that the weld zone has the lowest current density (0.3霢/cm2) and the largest impedance (169k?), which may be due to the presence of the densest microstructure and the smaller residual stress in the weld zone, and shows the best corrosion resistance.

Key words： friction stud welding; microstructure; residual stress; scanning vibrating electrode technique (SVET); local electrochemical impedance spectroscopy (LEIS)

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